Portability fix: explicitly state dependency on libtool 2.2+ and enforce it

diff --git a/configure.ac b/configure.ac
index f9640ff3337d1862ac25a242959491e3f1fd3561..7fd49b7d7a20c168d80c294e09699d10e32d8df5 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -110,7 +110,8 @@ else
   AC_DISABLE_SHARED
 fi
 
-AC_PROG_LIBTOOL
+# LT_INIT requires libtool v2, might as well state it loud
+LT_PREREQ ([2.2])
 LT_INIT([dlopen],[disable-shared])
 if ! test "${ac_top_build_prefix}" = "";
 then